<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script>
        var arr = [2, 6, 1, 52, 25, 7, 717];
        var max = arr[0];
        for (var i = 0; i < arr.length; i++) {
            if (arr[i] > max) {
                max = arr[i];
            }
        }
        console.log(max);
    </script>
</head>
<body>

</body>
</html>